{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38484", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.021Z", "datePublished": "2025-07-28T11:21:48.690Z", "dateUpdated": "2026-08-05T12:02:16.576Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:02:16.576Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niio: backend: fix out-of-bound write\n\nThe buffer is set to 80 character. If a caller write more characters,\ncount is truncated to the max available space in \"simple_write_to_buffer\".\nBut afterwards a string terminator is written to the buffer at offset count\nwithout boundary check. The zero termination is written OUT-OF-BOUND.\n\nAdd a check that the given buffer is smaller then the buffer to prevent." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only by a local `write(2)`/`pwrite(2)` on the debugfs file `/sys/kernel/debug/iio/iio:deviceN/backendM/direct_reg_access`. There is no network or remote data path into `iio_backend_debugfs_write_reg()`.\nAC:L - A single `write()` with any length ≥ 80 deterministically executes `buf[count] = '\\0'` out of bounds, and the attacker directly chooses the corruption offset via the syscall length. No race, no memory-layout precondition, and no unpredictable state is involved.\nPR:L - The debugfs node is created 0600, but debugfs on industrial/embedded IIO deployments is routinely mounted and permission-relaxed for instrumentation tooling, making the write reachable by an unprivileged local account; consistent with this CNA's scoring of comparable debugfs memory-corruption bugs (CVE-2026-43380, CVE-2026-46190). Choosing the higher-severity option where reachability depends on deployment configuration.\nUI:N - The attacker triggers the bug entirely on their own with one write syscall against an already-present device node. No action by any other user or administrator is required.\nS:U - The out-of-bounds write corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - Attacker-controlled stack corruption at a chosen offset can truncate saved pointers and length/size fields, which is readily leveraged into kernel memory disclosure, and full kernel compromise implies unrestricted read of system memory.\nI:H - This is a direct out-of-bounds write with an attacker-chosen offset spanning the kernel stack (return addresses, saved registers, stack canary) and, on non-VMAP_STACK builds, adjacent lowmem — a NUL-byte poisoning primitive usable for control-flow hijack and privilege escalation.\nA:H - Overwriting the stack canary, a return address, or hitting the VMAP_STACK guard page with a large offset causes an immediate kernel panic/oops, and the write can be repeated at will." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iio/industrialio-backend.c" ], "versions": [ { "version": "df3892e5e861c43d5612728ed259634675b8a71f", "lessThan": "6eea9f7648ddb9e4903735a1f77cf196c957aa38", "status": "affected", "versionType": "git" }, { "version": "035b4989211dc1c8626e186d655ae8ca5141bb73", "lessThan": "01e941aa7f5175125df4ac5d3aab099961525602", "status": "affected", "versionType": "git" }, { "version": "035b4989211dc1c8626e186d655ae8ca5141bb73", "lessThan": "da9374819eb3885636934c1006d450c3cb1a02ed", "status": "affected", "versionType": "git" }, { "version": "04271a4d2740f98bbe36f82cd3d74677a839d1eb", "status": "affected", "versionType": "git" }, { "version": "fd791c81f410ab1c554686a6f486dc7a176dfe35", "status": "affected", "versionType": "git" }, { "version": "6.12.23", "lessThan": "6.12.40", "status": "affected", "versionType": "semver" }, { "version": "6.13.11", "lessThan": "6.14", "status": "affected", "versionType": "semver" }, { "version": "6.14.2", "lessThan": "6.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iio/industrialio-backend.c" ], "versions": [ { "version": "6.15", "status": "affected" }, { "version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.40", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.8", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.23", "versionEndExcluding": "6.12.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.15.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.14.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6eea9f7648ddb9e4903735a1f77cf196c957aa38" }, { "url": "https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602" }, { "url": "https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed" } ], "title": "iio: backend: fix out-of-bound write", "x_generator": { "engine": "bippy-1.2.0" } } } }